Right click on internet explorer is slow

It started about a little over a week. I noticed that when I right click on internet explorer it takes about 2-3 seconds for it to show up and uses about 95% of CPU. It sometimes freezes for about 10 seconds and then goes back to normal. I ran ad aware, anti-virus, and spybot, but still nothing. My OS is XP. Any idea what it could be? Should I unistall explorer and reinstall again? Thanx